Improved bolt-heading machine



UNITED STATES PATENT EEIGE.

o. o. BUEDICT, on PROVIDENCE, RHODE IsLAND.'

IMPROVED BOLT-HEADING MACHINE.

Specification forming part of Letters Patent No. 97,35 l, dated November30, 1869.

To all 'whom it may concern Be it known that I, O. C. BURDICT, ofProvidence, in the county of Providence and State of Rhode Island, haveinvented a new Improvement in Bolt-Heading Machines 5 and I do herebydeclare the following, when t-aken in connection with the accompanyingdrawings and letters of reference marked thereon, to be a full, clear,and exact description of the same, and which said drawings constitutepart of this specification, and represent, in

Figure l, a top view; Fig. 2, a side view; Fig. 8, a forward-end view;Fig. 4, a longitudinal central section; Fig. 5, a sectional view, online x x, through the clamping-dies; Fig. 6, an enlarged end view of theupsetting-die; and in Fig. 7 a front view of the heading or swagingdies.

This invention relates to an improvement in the bolt-heading machine forwhich Letters Patent were granted to me, dated September 3, 1867 g andthe invention consists in the upsetting-die or plunger, constructed witha circular recess in its operating end, of a diame ter equal to thediameter of the head of the bolt across the angles, so that the extentof the angles being thus defined will not be forced by the swagingdiesso as to form a burr at the said angles, the plunger or upsetting-diefirst passing between the swaging-dies to upset the head, thenretreating for the swaging-dies to operate.

In order that others skilled in the art may construct and use myinvention, I will fully d escribe the same as illustrated in theaccompanyin g drawings.

A is the frame of the machine; B, the driving-shaft, supported inbearings G and driven by the application of power thereto through thepulley D, or in any convenient manner. E is the follower, operated by aneccentric, F, on the driving-shaft, as seen in Fig. 4. Gr G and G G arethe four die holders, arranged in guides H so as to move freelytoward acommon center.

On suitable bearings a are arranged levers I, one for each of thedie-holders, the shorter arm of the said levers working in a recess inthe said die-holders, as seen in Figs. 3 and 4, the longer arm of thesaid lever connected to the followerI by links d, (see Fig. 4,) wherethe follower is represented as being thrown for-4 ward to draw back thedie-holders. When, by the operation of the machine, the follower isdrawn back, then the links throw up the longer arm of the levers, asdenoted in Fig. 4, and consequently drive toward each other the severaldie-holders; and, if the machine continues to operate, each fullmovement of the follower causes an advance and retreat of thedie-holders. By the link-connections d and attachment of the levers tothe die-holders it will be seen that the operation is positive, andwithout the intervention of springs or their equivalent-s, as used in myformer machine.

To each of the die-holders, respectively, are attached dies f and f',here represented as for a square bolt. Two of the dies f are of thewidth of the narrowest dia-meter of the bolthead. `The other dies, f',are wider than the narrowest diameter of the bolt-head; so that when thedies advance to each other the two narrow dies pass between the twobroader dies, as seen in Fig. 7, and thus prevent, to a great extent,defects in the angle of the head; for in machines in which the dies areof equal width, and are arranged so as'to exactly meet at their angles,the metal of the head being swaged will force itself out at the angles,and thus form imperfect angles-a defect which increases as the machineis used.

To hold the bolt or blank while the head is being formed, I arrange apair of clampingdies, L, (see Fig. 5,) in slides L', each of the saidslides operating to move the dies equally to and from the center, asdenoted in Fig. 5. To thus operate the said dies, I arrange in the headsA vertical slides B', from which a toggle-link, G1, extends to theslides L.

The two said slides B' are connected together by rods G2, extending downand united at C3 to a lever, G4, (sce Fig. 4,) to which is attached atreadle, C5, to which the foot may be applied, to draw down the slides Band close the dies L, as denoted in Fig. 5. The holdin g-dies thusoperating free themselves entirely from the headed bolt, leaving itcentrally between the two, from which it may be readily and easilyremoved. V

In the followerl E the upsetting-die or plunger M is arranged, (see Fig.4,) the workin g-end of the said plunger being recessed, as at t',

about the depth of the head to be formed, the said recess being of acircular form, as seen in Fig. 5, enlarged, the diameter being the sameor no more than the largest diameter of the bolt-head N, so that inupsetting the metal the head at the angles will only be of the requireddiameter, thus removing from the angles the surplus metal, which, ifpermitted to expand beyond the angles7 would, by the operation of theswaging-dies, form a burr at the angles.

The arrangement of the machine is such that the operative parts areworked by a single cam or eccentric movement, the plunger orupsetting-die driving forward between, opening the swaging-dies to upsetthe metal, then the upsetting-die returning while the swaging-diesapproach each other to form the head. This operation is several timesrepeated, in order to form a perfect head.

The blank to be headed is dropped between the clamping-dies into aspace, P, and so as to rest against an adj usting-screw, R, and extendsufficiently far through the swaging-dies to allow suiicient metal toform the head.

. I do not claim any of the parts described, except in combination, ashereinafter specified.

Having fully described my invention, what I claim as new and useful, anddesire to secure by Letters Patent, .is-

The combination of the upsetting die M with the swaging-dies ff and ff', when the said die M is arranged so as to pass between theswaging-dies, so as to upset the head, in the manner substantially asset forth.

O. C. BURDICT.

Witnesses:

A. J. TIBBITS, J. H. SHUMWAY.

